auxetic การใช้

• The Poisson's ratio of a stable, auxetic materials.
• But auxetic materials expand at right angles to the pull.
• However, very few materials ( called auxetic materials ) exhibit this property.
• If these auxetic materials are stretched in one direction, they become thicker in the perpendicular direction.
• At the macroscale, auxetic behaviour can be illustrated with an inelastic string wound around an elastic cord.
• The use of the word " auxetic " to refer to this property probably began in 1991.
• Zetix is an auxetic material that is so strong it absorbs and disperses the energy from explosions without breaking.
• Designs of composites with inverted hexagonal periodicity cell ( auxetic hexagon ), possessing negative Poisson ratios, were published in 1985.
• Typically, auxetic materials have low density, which is what allows the hinge-like areas of the auxetic microstructures to flex.
• Typically, auxetic materials have low density, which is what allows the hinge-like areas of the auxetic microstructures to flex.
• In 2016, Ahmad Rafsanjani described the use of Islamic geometric patterns from tomb towers in Iran to create auxetic materials from perforated rubber sheets.
• Tomb towers of two Seljuk princes at Kharaghan, Qazvin province, Iran, covered with many different brick patterns like those that inspired Ahmad Rafsanjani to create auxetic materials
• Auxetic growth occurs in certain tissues, such as muscle, of the higher animals as well as in some organisms, such as nematodes, tunicates, and rotifers.
• The earliest published example of a synthetic auxetic material was in " Science " in 1987, entitled " Foam structures with a Negative Poisson's Ratio " by R . S . Lakes from the University of Iowa.
• In contrast, some anisotropic materials, such as carbon nanotubes, zigzag-based folded sheet materials, and honeycomb auxetic metamaterials to name a few, can exhibit one or more Poisson's ratios above 0.5 in certain directions.
• Researchers have observed ripples in suspended layers of graphene, It has recently been shown that these ripples, if amplified through the introduction of vacancy defects, can impart a negative Poisson's ratio into graphene, resulting in the thinnest auxetic material known so far.
• The term " auxetic " derives from the Greek word ?P??????? ( auxetikos ) which means " that which tends to increase " and has its root in the word ?T?????, or " auxesis ", meaning " increase " ( noun ).
• Auxetic behaviour at the macroscale can also be employed for the development of products with enhanced characteristics such as superior footwear based on the auxetic rotating triangles structures developed by Grima and Evans, which is meant to enable an athlete s natural motion and develop strength during running or training.
• Auxetic behaviour at the macroscale can also be employed for the development of products with enhanced characteristics such as superior footwear based on the auxetic rotating triangles structures developed by Grima and Evans, which is meant to enable an athlete s natural motion and develop strength during running or training.